Cluster analysis is a major tool in a number of applications in many fields of Business, Engineering & etc.(The odoridis and Koutroubas, 1999):
Data reduction.
Hypothesis generation.
Hypothesis testing.
Prediction based on groups.
This presentation was prepared as part of the curriculum studies for CSCI-659 Topics in Artificial Intelligence Course - Machine Learning in Computational Linguistics.
It was prepared under guidance of Prof. Sandra Kubler.
This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques
This presentation was prepared as part of the curriculum studies for CSCI-659 Topics in Artificial Intelligence Course - Machine Learning in Computational Linguistics.
It was prepared under guidance of Prof. Sandra Kubler.
This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques.This course is all about the data mining that how we get the optimized results. it included with all types and how we use these techniques
Decision tree is a type of supervised learning algorithm (having a pre-defined target variable) that is mostly used in classification problems. It is a tree in which each branch node represents a choice between a number of alternatives, and each leaf node represents a decision.
BIRCH (balanced iterative reducing and clustering using hierarchies) is an unsupervised data-mining algorithm used to perform hierarchical clustering over, particularly large data sets.
Data preprocessing techniques
See my Paris applied psychology conference paper here
https://www.slideshare.net/jasonrodrigues/paris-conference-on-applied-psychology
or
https://prezi.com/view/KBP8JnekVH9LkLOiKY3w/
k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.
Decision tree is a type of supervised learning algorithm (having a pre-defined target variable) that is mostly used in classification problems. It is a tree in which each branch node represents a choice between a number of alternatives, and each leaf node represents a decision.
BIRCH (balanced iterative reducing and clustering using hierarchies) is an unsupervised data-mining algorithm used to perform hierarchical clustering over, particularly large data sets.
Data preprocessing techniques
See my Paris applied psychology conference paper here
https://www.slideshare.net/jasonrodrigues/paris-conference-on-applied-psychology
or
https://prezi.com/view/KBP8JnekVH9LkLOiKY3w/
k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.
Lecture 8a: Clustering Validity, Minimum Description Length (MDL), Introduction to Information Theory, Co-clustering using MDL. (ppt,pdf)
Deepayan Chakrabarti, Spiros Papadimitriou, Dharmendra Modha, Christos Faloutsos, Fully Automatic Cross-Associations, KDD 2004, Seattle, August 2004. [PDF]
Some details about MDL and Information Theory can be found in the book “Introduction to Data Mining” by Tan, Steinbach, Kumar (chapters 2,4).
This talk was given at H2O World 2018 NYC and can be viewed here: https://youtu.be/xlTSk72QHbs
Speaker's Bio:
Leland Wilkinson is Chief Scientist at H2O and Adjunct Professor of Computer Science at the University of Illinois Chicago. He received an A.B. degree from Harvard in 1966, an S.T.B. degree from Harvard Divinity School in 1969, and a Ph.D. from Yale in 1975. Wilkinson wrote the SYSTAT statistical package and founded SYSTAT Inc. in 1984. After the company grew to 50 employees, he sold SYSTAT to SPSS in 1994 and worked there for ten years on research and development of visualization systems. Wilkinson subsequently worked at Skytree and Tableau before joining H2O. Wilkinson is a Fellow of the American Statistical Association, an elected member of the International Statistical Institute, and a Fellow of the American Association for the Advancement of Science. He has won best speaker award at the National Computer Graphics Association and the Youden prize for best expository paper in the statistics journal Technometrics. He has served on the Committee on Applied and Theoretical Statistics of the National Research Council and is a member of the Boards of the National Institute of Statistical Sciences (NISS) and the Institute for Pure and Applied Mathematics (IPAM). In addition to authoring journal articles, the original SYSTAT computer program and manuals, and patents in visualization and distributed analytic computing, Wilkinson is the author (with Grant Blank and Chris Gruber) of Desktop Data Analysis with SYSTAT. He is also the author of The Grammar of Graphics, the foundation for several commercial and opensource visualization systems (IBMRAVE, Tableau, Rggplot2, and PythonBokeh).
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Empowering the Data Analytics Ecosystem: A Laser Focus on Value
The data analytics ecosystem thrives when every component functions at its peak, unlocking the true potential of data. Here's a laser focus on key areas for an empowered ecosystem:
1. Democratize Access, Not Data:
Granular Access Controls: Provide users with self-service tools tailored to their specific needs, preventing data overload and misuse.
Data Catalogs: Implement robust data catalogs for easy discovery and understanding of available data sources.
2. Foster Collaboration with Clear Roles:
Data Mesh Architecture: Break down data silos by creating a distributed data ownership model with clear ownership and responsibilities.
Collaborative Workspaces: Utilize interactive platforms where data scientists, analysts, and domain experts can work seamlessly together.
3. Leverage Advanced Analytics Strategically:
AI-powered Automation: Automate repetitive tasks like data cleaning and feature engineering, freeing up data talent for higher-level analysis.
Right-Tool Selection: Strategically choose the most effective advanced analytics techniques (e.g., AI, ML) based on specific business problems.
4. Prioritize Data Quality with Automation:
Automated Data Validation: Implement automated data quality checks to identify and rectify errors at the source, minimizing downstream issues.
Data Lineage Tracking: Track the flow of data throughout the ecosystem, ensuring transparency and facilitating root cause analysis for errors.
5. Cultivate a Data-Driven Mindset:
Metrics-Driven Performance Management: Align KPIs and performance metrics with data-driven insights to ensure actionable decision making.
Data Storytelling Workshops: Equip stakeholders with the skills to translate complex data findings into compelling narratives that drive action.
Benefits of a Precise Ecosystem:
Sharpened Focus: Precise access and clear roles ensure everyone works with the most relevant data, maximizing efficiency.
Actionable Insights: Strategic analytics and automated quality checks lead to more reliable and actionable data insights.
Continuous Improvement: Data-driven performance management fosters a culture of learning and continuous improvement.
Sustainable Growth: Empowered by data, organizations can make informed decisions to drive sustainable growth and innovation.
By focusing on these precise actions, organizations can create an empowered data analytics ecosystem that delivers real value by driving data-driven decisions and maximizing the return on their data investment.
As Europe's leading economic powerhouse and the fourth-largest hashtag#economy globally, Germany stands at the forefront of innovation and industrial might. Renowned for its precision engineering and high-tech sectors, Germany's economic structure is heavily supported by a robust service industry, accounting for approximately 68% of its GDP. This economic clout and strategic geopolitical stance position Germany as a focal point in the global cyber threat landscape.
In the face of escalating global tensions, particularly those emanating from geopolitical disputes with nations like hashtag#Russia and hashtag#China, hashtag#Germany has witnessed a significant uptick in targeted cyber operations. Our analysis indicates a marked increase in hashtag#cyberattack sophistication aimed at critical infrastructure and key industrial sectors. These attacks range from ransomware campaigns to hashtag#AdvancedPersistentThreats (hashtag#APTs), threatening national security and business integrity.
🔑 Key findings include:
🔍 Increased frequency and complexity of cyber threats.
🔍 Escalation of state-sponsored and criminally motivated cyber operations.
🔍 Active dark web exchanges of malicious tools and tactics.
Our comprehensive report delves into these challenges, using a blend of open-source and proprietary data collection techniques. By monitoring activity on critical networks and analyzing attack patterns, our team provides a detailed overview of the threats facing German entities.
This report aims to equip stakeholders across public and private sectors with the knowledge to enhance their defensive strategies, reduce exposure to cyber risks, and reinforce Germany's resilience against cyber threats.
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...John Andrews
SlideShare Description for "Chatty Kathy - UNC Bootcamp Final Project Presentation"
Title: Chatty Kathy: Enhancing Physical Activity Among Older Adults
Description:
Discover how Chatty Kathy, an innovative project developed at the UNC Bootcamp, aims to tackle the challenge of low physical activity among older adults. Our AI-driven solution uses peer interaction to boost and sustain exercise levels, significantly improving health outcomes. This presentation covers our problem statement, the rationale behind Chatty Kathy, synthetic data and persona creation, model performance metrics, a visual demonstration of the project, and potential future developments. Join us for an insightful Q&A session to explore the potential of this groundbreaking project.
Project Team: Jay Requarth, Jana Avery, John Andrews, Dr. Dick Davis II, Nee Buntoum, Nam Yeongjin & Mat Nicholas
Adjusting primitives for graph : SHORT REPORT / NOTESSubhajit Sahu
Graph algorithms, like PageRank Compressed Sparse Row (CSR) is an adjacency-list based graph representation that is
Multiply with different modes (map)
1. Performance of sequential execution based vs OpenMP based vector multiply.
2. Comparing various launch configs for CUDA based vector multiply.
Sum with different storage types (reduce)
1. Performance of vector element sum using float vs bfloat16 as the storage type.
Sum with different modes (reduce)
1. Performance of sequential execution based vs OpenMP based vector element sum.
2. Performance of memcpy vs in-place based CUDA based vector element sum.
3. Comparing various launch configs for CUDA based vector element sum (memcpy).
4. Comparing various launch configs for CUDA based vector element sum (in-place).
Sum with in-place strategies of CUDA mode (reduce)
1. Comparing various launch configs for CUDA based vector element sum (in-place).
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Subhajit Sahu
Abstract — Levelwise PageRank is an alternative method of PageRank computation which decomposes the input graph into a directed acyclic block-graph of strongly connected components, and processes them in topological order, one level at a time. This enables calculation for ranks in a distributed fashion without per-iteration communication, unlike the standard method where all vertices are processed in each iteration. It however comes with a precondition of the absence of dead ends in the input graph. Here, the native non-distributed performance of Levelwise PageRank was compared against Monolithic PageRank on a CPU as well as a GPU. To ensure a fair comparison, Monolithic PageRank was also performed on a graph where vertices were split by components. Results indicate that Levelwise PageRank is about as fast as Monolithic PageRank on the CPU, but quite a bit slower on the GPU. Slowdown on the GPU is likely caused by a large submission of small workloads, and expected to be non-issue when the computation is performed on massive graphs.
Opendatabay - Open Data Marketplace.pptxOpendatabay
Opendatabay.com unlocks the power of data for everyone. Open Data Marketplace fosters a collaborative hub for data enthusiasts to explore, share, and contribute to a vast collection of datasets.
First ever open hub for data enthusiasts to collaborate and innovate. A platform to explore, share, and contribute to a vast collection of datasets. Through robust quality control and innovative technologies like blockchain verification, opendatabay ensures the authenticity and reliability of datasets, empowering users to make data-driven decisions with confidence. Leverage cutting-edge AI technologies to enhance the data exploration, analysis, and discovery experience.
From intelligent search and recommendations to automated data productisation and quotation, Opendatabay AI-driven features streamline the data workflow. Finding the data you need shouldn't be a complex. Opendatabay simplifies the data acquisition process with an intuitive interface and robust search tools. Effortlessly explore, discover, and access the data you need, allowing you to focus on extracting valuable insights. Opendatabay breaks new ground with a dedicated, AI-generated, synthetic datasets.
Leverage these privacy-preserving datasets for training and testing AI models without compromising sensitive information. Opendatabay prioritizes transparency by providing detailed metadata, provenance information, and usage guidelines for each dataset, ensuring users have a comprehensive understanding of the data they're working with. By leveraging a powerful combination of distributed ledger technology and rigorous third-party audits Opendatabay ensures the authenticity and reliability of every dataset. Security is at the core of Opendatabay. Marketplace implements stringent security measures, including encryption, access controls, and regular vulnerability assessments, to safeguard your data and protect your privacy.
2. Overview
• What is cluster analysis?
• Why Cluster Analysis
• Clustering Methods
• Analysis
Background of Data
Objectives
Hierarchical Clustering
K mean Clustering
Validation
3. What is cluster analysis?
• What this means?
When plotted geometrically,
objects within clusters should be
very close together and clusters
will be far apart.
• Clusters should exhibit high
internal homogeneity and high
external heterogeneity
Cluster analysis is a multivariate data mining technique whose goal is to
groups objects based on a set of user selected characteristics
4. Why Cluster Analysis
Cluster analysis is a major tool in a number of applications in many fields
of Business, Engineering & etc.(The odoridis and Koutroubas, 1999):
• Data reduction.
• Hypothesis generation.
• Hypothesis testing.
• Prediction based on groups.
5. Cluster Analysis – Classification
Clustering
Hierarchical clustering
Divisive
Agglomerative
Partitional clustering
K-means
Fuzzy K-means
Isodata
Density based
clustering
Denclust
CLUPOT
SVC
Parzen-
Watershed
Grid based clustering
STING
CLIQUE
6. Background Story
• These data, collected by Colonel L.A. Waddel, were
first reported in Morant (1923) . The data consist of
five measurements on each of 32 skulls found in the
southwestern and eastern districts ofTibet.
• The first comprises skulls 1 to 17 found in graves in
Sikkim and the neighboring area of Tibet (Type A
skulls). The remaining 15 skulls (Type B skulls) were
picked up on a battlefield in the Lhasa district and
are believed to be those of native soldiers from the
eastern province of Khams.
7. Objective
Hypothesis test:
Tibetans from Khams might be survivors of a particular human type,
unrelated to the Mongolian and Indian types that surrounded them.
• Greatest length of skull (Length)
• Greatest horizontal breadth of skull (Breadth)
• Height of skull (Height)
• Upper face length (Fheight)
• Face breadth between outermost points of cheekbones (Fbreadth)
8. Matrix Plot
Preliminary graphical display of the data
might be useful and here we will display
them as a scatter plot matrix in which
group membership is indicated. While this
diagram only allows us to asses the group
separation in two dimensions, it seems to
suggest that face breadth between outer-
most points of cheek bones (Fbreadth),
greatest length of skull (Length), and
upper face length (Fheight) provide the
greatest discrimination between the two
skull types
9. Descriptive / Correlations
Highest mean is 179.94 in Length of skull which
varying in between 200 (max) and 162.5(min).
lowest mean is 72.94 in Fheight which varying in
between 82.5 to 62.
As per the correlation matrix there are high
correlation among Length and
Fheight(0.755,p=0.00). Other than that Fheight
and Fbreadth (0.617,0.00), Length and
Fbreadth(0.567,0.01), Breadth and
Fbreadth(0.549,0.01) are significant
10. Number of clusters
The correct choice of number of clusters is often ambiguous, with interpretations
depending on the shape and scale of the distribution of points in a data set and the
desired clustering resolution of the user
• The rules of thumb is k=(n/2)^1/2 : where k is the number of clusters
• Plotting % of variance vs number of clusters
• In our case number of clusters is 2
11. Hierarchical Clustering
• Agglomerative (Bottom-up):
Principle: compute the Distance-Matrix between all objects (initially
one object = one cluster). Find the two clusters with the closest
distance and put those two clusters into one. Compute the new
Distance-Matrix
12. Hierarchical Clustering contd.
• data were analyzed under different linkage measurements vs squared
Euclidian distance methods
SUMMARYTABLE
Linkage Distance Cluster 1 Cluster 2 Cluster 1 Cluster 2
A B A B
Average Squared Euclidian A-6 A-11, B-15 35% 0% 65% 100%
Centroid Squared Euclidian A-6 A-11, B-15 35% 0% 65% 100%
Complete Squared Euclidian A-14, B-5 A-3, B-10 82% 33% 18% 67%
Single Squared Euclidian A-17, B-14 B-1 100% 93% 0% 7%
Ward Squared Euclidian A-16, B-5 A-1, B-10 94% 33% 6% 67%
14. Complete Linkage Squared Euclidean Ward Linkage Squared Euclidean
The Dendrogram displays the information in the amalgamation table in the form of a tree
diagram. The first table summarizes each cluster by the number of observations, the within
cluster sum of squares, In general, a cluster with a small sum of squares is more compact than
one with a large sum of squares. The centroid is the vector of variable means for the
observations in that cluster and is used as a cluster midpoint. The second table displays the
centroids for the individual clusters while the third table gives distances between cluster
centroids.
16. Case Number Type Cluster Case Number Type Cluster
1 A 1 17 A 2
2 A 2 18 B 1
3 A 2 19 B 2
4 A 2 20 B 1
5 A 2 21 B 1
6 A 2 22 B 1
7 A 2 23 B 2
8 A 2 24 B 1
9 A 2 25 B 1
10 A 2 26 B 1
11 A 2 27 B 1
12 A 2 28 B 1
13 A 2 29 B 2
14 A 1 30 B 1
15 A 2 31 B 1
16 A 2 32 B 2
K Mean Contd. Cluster Membership
17. K Mean Clustering Contd.
Out of 17 of A-type skulls 15 skulls present in one cluster(88.2%).
Out of 15 skulls 11 B-type skulls present in another cluster (77.3%).
The output of K-mean clustering quite better than the out put of
ward and complete in hierarchical clustering.
18. Cluster Validation
• Fisher’s Linear Discriminant Analysis
• Use discriminant analysis to classify observations into two or more
groups if you have a sample with known groups. Discriminant
analysis can also used to investigate how variables contribute to
group separation.
• For two groups, the null hypothesis is that the means of the two
groups on the discriminant function-the centroids, are equal.
• Centroids are the mean discriminant score for each group. Wilk’s
lambda is used to test for significant differences between groups
19. Cluster Validation contd.
The canonical relation is a correlation between
the discriminant scores and the levels of the
dependent variable. A high correlation (0.825)
indicates a function that discriminates well.
Wilks’ Lambda is the ratio of within-groups sums
of squares to the total sums of squares. Wilks'
lambda is a measure of how well each function
separates cases into groups. Smaller values of
Wilks' lambda indicate greater discriminatory
ability of the function. The associated
significance value indicate whether the
difference is significant. Here, the Lambda of
0.319 and significant p= 0.00)thus, the group
means appear to significantly different from
each other
20. Cluster Validation contd.
This table is used to assess how well the
discriminant function works, and if it works equally
well for each group of the dependent variable.
Here cross validated accuracy is about 87.5% and
this is quite good result
21. Summary
• Out of 17 of A-type skulls 16 skulls present in one cluster(94%). Out of
15 skulls 10 B-type skulls present in another cluster (67%) according to
Ward linkage hierarchical clustering
• Out of 17 of A-type skulls 15 skulls present in one cluster(88.2%). Out
of 15 skulls 11 B-type skulls present in another cluster (77.3%)
according to K-mean clustering
• Group means appear to significantly different from each other
according to discriminant analysis
• Thus Tibetans from Khams district significantly different from
generalTibetans according to the skull measurements
22. References
• Joseph F. Hair Jr.,Willim C. Black, Barry J. Babin, Rolph E. Anderson –
“Multivariate Data Analysis – a global perspective”
• Brian S. Everitt ,Sabine Landau “Cluster Analysis” 5th edition
• Mo'oamin M. R. El-Hanjouri , Bashar S. Hamad “Using Cluster Analysis
and Discriminant Analysis Methods in Classification with Application on
Standard of Living Family in Palestinian Areas” International Journal of
Statistics and Applications,2015
Hypothesis generation. Cluster analysis is used here in order to infer some hypotheses
concerning the data. For instance we may find in a retail database that there are two
significant groups of customers based on their age and the time of purchases. Then,
we may infer some hypotheses for the data, that it, “young people go shopping in the
evening”, “old people go shopping in the morning”.
Hypothesis testing. In this case, the cluster analysis is used for the verification of the
validity of a specific hypothesis. For example, we consider the following hypothesis:
“Young people go shopping in the evening”. One way to verify whether this is true is
to apply cluster analysis to a representative set of stores. Suppose that each store is
represented by its customer’s details (age, job etc) and the time of transactions. If, after
applying cluster analysis, a cluster that corresponds to “young people buy in the evening”
is formed, then the hypothesis is supported by cluster analysis.